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Vulnerabilities

Vulnerability · CVE-2021-22890

curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets.

Published Apr 1, 2021 · catalog updated Oct 14, 2026 · curl 7.63.0 to and

Check if you run it

No confirmed exploitation is on record for CVE-2021-22890. EPSS is 3.06%. Act only if a listed version of curl 7.63.0 to and is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (curl 7.63.0 to and).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low3.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
3.06%
Remediation
Advisory link
Affected products
cpe broadcom/fabric operating system · cpe debian/debian linux · cpe fedoraproject/fedora · cpe haxx/libcurl · cpe netapp/hci management node · cpe netapp/hci storage node

curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe broadcom/fabric operating systemversion unspecified
  • cpe debian/debian linux9.0
  • cpe fedoraproject/fedora32
  • cpe fedoraproject/fedora33
  • cpe fedoraproject/fedora34
  • cpe haxx/libcurlversion unspecified
  • cpe netapp/hci management nodeversion unspecified
  • cpe netapp/hci storage nodeversion unspecified
  • cpe netapp/solidfireversion unspecified
  • cpe oracle/communications billing and revenue management12.0.0.3.0
  • cpe siemens/sinec infrastructure network servicesversion unspecified
  • cpe splunk/universal forwarderversion unspecified

How to fix CVE-2021-22890

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-22890. EPSS is 3.06%. Act only if a listed version of curl 7.63.0 to and is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 9.0; oracle/communications billing and revenue management 12.0.0.3.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-290: Authentication Bypass by Spoofing; CWE-300. EPSS 3.06%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 1, 2021 · NIST NVD

    Detected

    curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HT

  2. Oct 14, 2026 · NIST NVD

    Updated

    curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HT

Sources

  • CVE.orgVulnerability recordCVE-2021-22890

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-22890

    30-day exploitation probability 3.1%

    first.org
  • NIST NVDVulnerability recordCVE-2021-22890

    curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.